Frequently Asked Questions

How much carbon dioxide is produced by burning gasoline and diesel fuel?

About 19.64 pounds of carbon dioxide (CO2) are produced from burning a gallon of gasoline that does not contain ethanol. About 22.38 pounds of CO2 are produced from burning a gallon of diesel fuel.

EIA estimates1 that U.S. motor gasoline and diesel (distillate) fuel consumption for transportation in 2015 resulted in the emission of about 1,105 million metric tons of CO2 and 440 million metric tons of CO2, respectively, for a total of 1,545 million metric tons of CO2. This total was equivalent to 83% of total U.S. transportation sector CO2 emissions and equivalent to 29% of total U.S. energy-related CO2 emissions in 2015.

Under international agreement, CO2 emissions from the combustion of biomass or biofuels are not included in national greenhouse gas emissions inventories.2 Most of the retail gasoline now sold in the United States contains about 10% fuel ethanol (or E10) by volume. Burning a gallon of E10 produces about 17.68 pounds of CO2 that is emitted from the fossil fuel content. If the CO2 emissions from ethanol combustion are considered, then about 18.95 pounds of CO2 are produced when a gallon of E10 is combusted. About 12.73 pounds of CO2 are produced when a gallon of pure ethanol is combusted.

Biodiesel fuel can be purchased in many states. Biodiesel fuel is sold with various amounts of biodiesel content. B20 is a commonly sold biodiesel fuel. B20 contains 20% biodiesel and 80% petroleum diesel fuel. Burning a gallon of B20 results in the emission of about 17.90 pounds of CO2 that is emitted from the fossil fuel content. If the emissions from burning the biodiesel in B20 are included, then about 22.06 pounds of CO2 are produced. About 20.77 pounds of CO2 are produced from burning a gallon of B100 (100% biodiesel).